A=xlsread('questionsdata.xlsx','A2:L500');
l=size(A,1);
anchorcoefficients=[];

for i=1:l;
    yvec=A(i,6:8)';
    xvec=[ones(3,1) A(i,3:5)' [280 604 106]'];
    b = regress(yvec,xvec);
    anchorcoefficients=[anchorcoefficients;b(2)];
end
display(anchorcoefficients);
%display(anchorcoefficientsnoanswers);
hist(anchorcoefficients,1001);
size(anchorcoefficients)